Reference Model of LLSVP Morphology

Reference Model of LLSVP Morphology

Using depth-dependent clustering analysis of global Vs and Vp tomographic models, we have constructed a new reference model for LLSVP shape and volume. We obtain...

[Read More...]
3D Reference Earth Model

3D Reference Earth Model

REM-3D is a project funded by the National Science Foundation and carried out by Raj Moulik, Ved Lekic, Barbara Romanowicz, and Adam Dziewonski. If you have...

[Read More...]
Viscosity increase in the Earth’s mid mantle

Viscosity increase in the Earth’s mid mantle

Together with collaborators Max Rudolph at Portland State University and Carolina Lithgow-Bertelloni at University College London, we used a novel inversion framework to detect the...

[Read More...]
Lithospheric Structure of the Western United States

Lithospheric Structure of the Western United States

Using data from the EarthScope Transportable Array, we observed and modeled conversions of S waves to P waves across velocity contrasts within the lithosphere across...

[Read More...]
Lithospheric thinning beneath rifted regions of Southern California

Lithospheric thinning beneath rifted regions of Southern California

Conversions of teleseismic shear (S) waves to compressional (P) waves across velocity interfaces (such as the Moho or the lithosphere-asthenosphere boundary) allow us to map...

[Read More...]
Cluster analysis of upper mantle tomography

Cluster analysis of upper mantle tomography

When cluster analysis is used to classify the profiles of shear velocity (Vs) into N groups whose members are similar, the geographic extents of these...

[Read More...]
Full waveform tomography with the spectral element method

Full waveform tomography with the spectral element method

Map of lateral variations in the velocity of seismic shear waves (S-waves) at a depth of 125 km. Warm colors denote slower wavespeeds, and are...

[Read More...]
Frequency dependence of seismic attenuation

Frequency dependence of seismic attenuation

Preferred model (solid line) of frequency dependence of attenuation within the absorption band compared with constraints from laboratory studies (hachured region) and the frequency-independent assumption...

[Read More...]
Lithospheric structure beneath continental rifts

Lithospheric structure beneath continental rifts

Isotropic shear wavespeed variations in the upper mantle from the SEMum model [Lekic and Romanowicz, 2008]. The model is developed using the spectral element method...

[Read More...]